I have a 2009 RAM red rear derailleur with a broken titanium spring. Seems a shame to toss the whole derailleur--I'd like to replace the spring. I'm sure some of you have successfully done this and can offer advice.

Questions:

1) Where did you source the spring (SRAM says not available through them)?2) Did you replace with ti or steel?3) How did you remove/replace the parallelogram pin(s)?

...Most shops will not be interested or willing to take-apart or tune a derailleur of any brand. Maybe FWB and similar shops would, but those are few and far between. Most shops want to sell you a new derailleur - and you can't blame them for that, but sales are their modus operandi, obviously.

The pins can be knocked out and in with a hammer and a rod of some sort. Obviously surfaces will be marred, and you will need to clamp the body securely somehow. Take a look at a few threads on 'tuning SRAM Red' here and across the internet, it has been done before and I believe I have seen documentation on the method.

As for the spring: you can possibly order the part directly from SRAM. Look at their technical documents, the spring has a part number. Call up SRAM (they'll answer the phone, very good customer service and super friendly folks), they might send you one if they have them available.

If they do not have the spring, it is possible to have someone out there in the ether make one for you. There are various persons and companies that make custom springs. At that point, however, it may be cheaper to just get a new derailleur.

1) I *have* called SRAM tech support, and the person I spoke with said the spring is not really replaceable. I'll have to press him on "really."

2) SRAM tech docs do not show the spring as a separate item with a part number.

3) The parallelogram pins do not go all the way through the derailleur, so there is no obvious way to push them out. Drill out, perhaps, but that might damage the body enough to render the derailleur unusable. Of course, any type of attempt to replace the spring may render the derailleur unusable...but it is unusable now...so no worse off.

4) I'll look again through the threads on tuning. I saw ideas there, but not specific steps. Maybe I haven't looked far enough.

The pins are easy to get out if you can't get a warranty replacement, but it will leave a tiny drill hole. I used the thinnest drill in my set then just tapped them gently out. Push SRAM for a spring, at least.

_________________Used to race....got too wrinkly and old Updated: Racing again! Thought this was unlikely! Eventually, I may even have a decent race!Edit: HAD a decent race! 16/08/2014

hi, sorry for refresh this old topic, but i have same problem, i want to change it for another sram spring,i am not sure how i can open derailleur cage, if i drill the 4 pins, there are bolts under pins? or have i to drill deep? then how to close the cage after this operation? :S sorry by my limited knowledge, really thanks.Diego.

and again I'll say don't mess with it unless Sram absolutely refuses to replace the whole thing. The one I returned was at least 4 years old. I just walked into a Sram dealer without a receipt and they sent it back for me. A week later and presto - new RD.

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